Shoulder Muscles

Question 1

deltoid origin

Answer 1

lateral one-third of the clavicle, acromion, the lower lip of the crest of the spine of the scapula

Question 2

deltoid insertion

Answer 2

deltoid tuberosity of the humerus

Question 3

deltoid action

Answer 3

abducts arm; medially & laterally rotate the arm

Question 4

deltoid innervation

Answer 4

axillary nerve

Question 5

deltoid artery

Answer 5

posterior circumflex humeral a.

Question 6

Supraspinatus Origin

Answer 6

supraspinatous fossa

Question 7

Supraspinatus Insertion

Answer 7

greater tubercle of the humerus (highest facet)

Question 8

Supraspinatus Action

Answer 8

initiates abduction

Question 9

Supraspinatus Inervation

Answer 9

suprascapular nerve

Question 10

Supraspinatus Artery

Answer 10

suprascapular a.

Question 11

Infraspinatus Origin

Answer 11

infraspinatous fossa

Question 12

Infraspinatus Insertion

Answer 12

greater tubercle of the humerus (middle facet)

Question 13

Infraspinatus Action

Answer 13

laterally rotates the arm

Question 14

Infraspinatus Artery

Answer 14

suprascapular a.

Question 15

Infraspinatus Innervation

Answer 15

suprascapular nerve.

Question 16

Teres Minor Origin

Answer 16

upper 2/3 of the lateral border of the scapula

Question 17

Teres Minor Insertion

Answer 17

greater tubercle of the humerus (lowest facet)

Question 18

Teres Minor Action

Answer 18

laterally rotates the arm

Question 19

Teres Minor Artery

Answer 19

circumflex scapular a.

Question 20

Teres Minor Innervation

Answer 20

axillary nerve

Question 21

Teres Major Origin

Answer 21

dorsal surface of the inferior angle of the scapula

Question 22

Teres Major Insertion

Answer 22

crest of the lesser tubercle of the humerus

Question 23

Teres Major Action

Answer 23

adducts the arm, medially rotates the arm, assists in arm extension

Question 24

Teres Major Artery

Answer 24

circumflex scapular a.

Question 25

Teres Major Innervation

Answer 25

subscapular nerve

Question 26

Subscapularis Origin

Answer 26

medial two-thirds of the costal surface of the scapula (subscapular fossa)

Question 27

Subscapularis Insertion

Answer 27

lesser tubercle of the humerus

Question 28

Subscapularis Action

Answer 28

medially rotates the arm; assists extention of the arm

Question 29

Subscapularis Artery

Answer 29

subscapular a.

Question 30

Subscapularis Innervation

Answer 30

subscapular nerve

Question 31

Quadrangle Space

Answer 31

Superior border: inferior border of Teres Minor Inferior Border: Superior border of Teres Major Medial Border: Lateral border of Long Head Lateral Border: Medial border of lateral head

Question 32

Axillary Nerves

Answer 32

Deltoid, Teres Minor

Question 33

Collateral Circulation

Answer 33

Axillary artery cross the scapula towards humerus and descend inferiorly. If blockage in axillary occurs in scapular region, the subscapular artery can circumvent the blocked area around border of scapula.